list1 = []
list2 = [1, 2]
list3 = [3, 4]
list4 = [5, 6]
list5 = [7, 8]
list6 = [9, 10]
list7 = [11, 12]
list8 = [13, 14]
list9 = [15, 16]
list10 = [17, 18]
list11 = [19, 20]

list1.append('hhh')
list3.extend(list2)
list4.insert(1, 7)
del(list5[0])
list6.pop()
list7.remove(11)
list8.clear()
list9[0] = 'aa'
list10.reverse()
# True降序 False 升序
list11.sort(reverse=True)
list12 = list11.copy()
print(list1)
print(list2)
print(list3)
print(list4)
print(list5)
print(list6)
print(list7)
print(list8)
print(list9)
print(list10)
print(list11)
print(list12)

i = 0
while i < len(list12):
    print(list12[i])
    i += 1
    
for j in list12:
    print(j)